Number of the day: $6.34 billion
If you want to see how this has changed over time, you may not believe it, but this chart is showing inflation adjusted $ values. I've put in for contrast the comparable data for retirement related transfer payments, the bulk, but not all, of which is Social Security. Also, if you really start to ponder this graph, you have to know a couple big factoids. The elderly population (age 65 and over) for the Pittsburgh region peaked in the mid 1990s, around 1995/6 and then decreased for much of the next 15 years. Only in recent years has that trend stabilized and likely begun to increase. So the growth observed over the last two decades is not because that population has been growing here, but it will be into the foreseeable future again.